A combination of a low pass and high pass filter, as well as a clean gain. 
 
The low pass filter is a 12 dB per octave high frequency filter. The LPF knob controls the cutoff frequency and ranges continuously from 20 kHz to 330 Hz.
 
The high pass filter is a 12 dB per octave low frequency filter. The HPF knob controls the cutoff frequency and ranges continuously from 25 Hz to 190 Hz.
 
The gain control ranges from unity gain to +20dB.
 
The stock input impedance is 1MΩ. If you have an acoustic pickup that requires a specialized input impedance, write it in the notes during check-out, and we will accomodate the request at no extra cost. The output impedance is 100Ω. This device will work with active or passive instruments, as well as with other devices such as pedals, preamps, or effects loops.
 
The pedal can be powered by a 9V battery or a DC power supply (not included). The DC supply should be a standard Boss style connector, center negative polarity. It can accept 9 to 24 volts. Although 9 volts is sufficient for most applications, higher voltages will provide more headroom when using the pedal with hotter signals. The current draw is approximately 10 mA. A 24 volt power supply may be purchased separately.
 
The Low + High Pass Filter comes standard with a true bypass switch. The pedal can be upgraded to a soft touch relay based bypass system for an extra $20. The soft touch switch does not have a mechanical click when stomped, and is true bypass.
 
Dimensions: 4.77" long x 2.6" wide